Crystal structures of ethyl 6-(4-methyl­phen­yl)-4-oxo-4H-chromene-2-carboxyl­ate and ethyl 6-(4-fluoro­phen­yl)-4-oxo-4H-chromene-2-carboxyl­ate

Gomes, L.R.; Low, J.N.; Fernandes, C.; Gaspar, A.; Borges, F.

doi:10.1107/S2056989015022781

Acta Crystallographica Section E
Acta Crystallographica
Section E CRYSTALLOGRAPHIC COMMUNICATIONS

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Figure 8
Compound (2), the simple C9 chain formed by the C65—H65⋯O4 weak hydrogen bond. This chain of rings extends along the a axis and is generated by the twofold screw axis at (1, y, $[{3\over 4}]$ ). Symmetry codes: (i) −x + 2, y + $[{1\over 2}]$ , −z + $[{3\over 2}]$ ; (ii) −x + 2, y − $[{1\over 2}]$ , −z + $[{3\over 2}]$ . H atoms not involved in the hydrogen bonding are omitted.

CRYSTALLOGRAPHIC
COMMUNICATIONS

ISSN: 2056-9890

Volume 72| Part 1| January 2016| Pages 8-13

doi:10.1107/S2056989015022781

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